My sideboards always are and need constant revision, due to the shifting metagame, cards that were not as good as I anticipated, and surprisingly bad matchups
It lets you search for two energy cards and attach them to your bench, and energy acceleration is just always useful
Some instants and sorceries with delirium abilities have an upgraded effect when they resolve or a modified cost as they're cast if there are four or more card types among cards in your graveyard
This decision happened after WOE was printed, so the Enchanting Tales Bitterblossom still has the word tribal in its type line
Theyre influenced by mythology, but have quite a bit in common with our modern idea of superheroes
Some could get printed as filler in some sets, but who cares if we get something like Shorecomber Crab in paper Magic